挑战习题
1
/5
单选题
难度:
1.下列算式正确的是()
A
3+(-2)+(+2)=1
B
4+(-6)+3=(-6)+4+3
C
[5+(-2)]+4=(5+4)+2
D
提示1:
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正确答案:
Qg==
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2
/5
单选题
难度:
2.7+(-3)+(-4)+18+(-11)=(7+18)+[(-3)+(-4)+(-11)]是应用了()
A
加法交换律
B
加法结合律
C
分配律
D
加法交换律与结合律
提示1:
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正确答案:
RA==
5Yqg5rOV57uT5ZCI5b6L77yaKGErYikrYz1hKyhiK2MpLOWKoOazleS6pOaNouW+i++8mmErYj1iK2HvvIzmlYXpgIlE
3
/5
单选题
难度:
3.计算
的结果是()
A
18
B
-18
C
-9
D
0
提示1:
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正确答案:
RA==
5Y6f5byPPGltZyB3aWR0aD0zMzEgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvM0UvRUQvckJBQ0oxVElvWG5TWmwySUFBQUZqQ2hyTDNZNTQ0LnBuZyI+
4
/5
单选题
难度:
4.用简便方法计算:
的值为()
A
0
B
1
C
D
提示1:
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正确答案:
Qw==
5Y6f5byPPTxpbWcgd2lkdGg9MzU5IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0FBLzMxL3JCQUNGRlRJb1ctUlowNHhBQUFGdXhSYWZHNDg4NS5wbmciPg==
5
/5
单选题
难度:
5.已知有理数a满足-a+|a|>0,则()
A
a为正数
B
a为负数
C
a为非零有理数
D
a为非正有理数
提示1:
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正确答案:
Qg==
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